I had not designed a coffee cup for a long time. The previous one was the Moebius Cup I think.
So here is a new one.
The Sphere Cup:

This cup should contain 50ml of coffee, enough for an espresso.
Its design is very simple: it is only made of spheres and planes. the advantage of the sphere is that it contains a maximum of volume for a minimum of surface.
I used a new technique of modeling to insure a constant thickness and no sharp angle.

I realize that perhaps it is not easy to understand the shape of the handle: it is a flat portion of disc filling the void left when removing from the initial sphere another sphere of the same size. A second disc makes the bottom of the cup.
I added a picture, upside down, to clarify:

Well, I hope you can put your fingers far enough from the hot inner surface, but this is something to check. Regarding the grip, the model is quite small and even with coffee inside, it will e relatively light, so I hope you can grab it!
But, this being said, you are right: I designed this cup more with aesthetical considerations in mind than functional ones .

This will be also the case with my next cup that is currently being uploaded....
Stay tuned.

I took me more time than expected because my first version was too big (100ml) and thus too expensive: like the Sphere Cup, this new version should contain 50ml of espresso.
Here is the Not So Concave Cup.
This is an upgrade of the Concave Mug: its new shape is more efficient in terms of capacity (that's why I made it smaller). But it is not as concave as the initial shape, thus its weird name.
Only the inner sphere should be hot (hopefully ).

Concerning the Not So Concave Cup, even if it is not as a suitable cup as I expected, I love the shape so I will keep it. But I decided to rename it. When I showed it someone told me that it looked like an hypercube. And this is true. So I decided to rename it Hypersphere, and I designed its little brother, the Hypercube.

What those objects are intended for? I let you decide! Personally, I just love them!

But instead, I have good hope that the Half-Hypersphere will be suitable as an espresso cup.